lupin+snow
I don't have a definitive answer for you. I've never been around another wolf while transformed, but I was particularly violent on the night of the battle — which I think had something to do with sensing other wolves.
Among other animals — Sirius is a dog, and James is a stag — I can usually keep my own head and be around them safely, but I have concerns that werewolves may fight one another for territory.
Then again, I also know of werewolves who've shunned society and gone off to form [...] packs, I suppose. In the presence of a human they'll undoubtedly turn their efforts toward that human, but I wouldn't try placing them together without precautions.